Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a63bb5840fdf25b…

MALICIOUS

PDF

77.2 KB Created: 2021-07-14 07:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 735d92048b30fd40f4337904870efbef SHA-1: e1794600e4e189ac1d5b0cb33c7d0efc371de4cf SHA-256: 9a63bb5840fdf25bbe7a3d751a347164ad1bf89b7a8222e1391131379d5fb85b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI that, while labeled as benign in the provided context, is presented in a way that suggests a lure for downloading content. The document body is heavily obfuscated, preventing a deeper analysis of its specific intent beyond the presence of the URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://feedproxy.google.com/~r/sq/ugae/~3/uzX87CUNjRg/square?utm_term=medstudy+17th+edition+pdf+free+download
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8f65ac91b61347ea1ce67/1625880154998/forms_of_bind.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee2e448685745b7d13ef79/1626222148196/zezotiwinopinatelugapu.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c9e873083775092e1282/1625868776240/how_to_breed_pufferfish_minecraft.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec84b7dcef4a49b3ab0384/1626113207783/mp4_3gp_video_download.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec918d05183b3b579e7cad/1626116493440/rewomig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c880.bin
4e0b4aa4967d42b88c44850896113f93783e9a23e72b5dab405d9b62d23c29fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC880 17712 bytes
font_01_sfnt_off0000f70b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 16792 bytes
font_02_sfnt_off00010f22.bin
773c0a0a5159dd341f14235c89e98f32feff0df0207fc01e7def4c5c35baa8f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 10988 bytes

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